December 2010
Intermediate to advanced
451 pages
11h 16m
English
Content preview from Oracle and PL/SQL Recipes: A Problem-Solution Approach
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3-3. Evaluating Multiple Mutually Exclusive Conditions
Problem
Your application has multiple conditions to evaluate, and each of them is mutually exclusive. If one of the conditions evaluates to FALSE, you'd like to evaluate the next one. You want that process to continue until there are no more conditions.
Two solutions are possible: one using IF and the other using CASE.
Solution #1
Use an IF-ELSIF-ELSE statement to perform an evaluation of all mutually exclusive conditions. The following example is a SQL*Plus script that queries how many countries are in a specified region.
Note The following example uses SQL*Plus substitution variables. Be ...
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